EFFECT OF BIOFLOC TECHNOLOGY ON GROWTH AND IMMUNE RESPONSE OF NILE TILAPIA, OREOCHROMIS NILOTICUS
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Date
2017-02
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
The present study: “Effect of biofloc technology on growth and
immune response of Nile tilapia, O. niloticus” was conducted in the
Wet Laboratory of the Department of Aquaculture, College of Fishery
Science, Sri Venkateswara Veterinary University, Muthukur.
A 60 day indoor trail was carried out to evaluate biofloc and
biofloc cum substrate based rearing systems on the growth
performance, non-specific immune response of Nile tilapia,
Oreochromis niloticus fingerlings. The C/N ratio of 15 was maintained
in three biofloc treatments viz., T1 (only biofloc), T2 (biofloc +
bamboo) and T3 (biofloc + nylon mat substrates) using wheat flour as
carbon source along with control (without biofloc and substrate). Each
“Effect of biofloc technology on
growth and immune response of Nile
tilapia, O. niloticus”
Master of Fishery Science in Aquatic
Animal Health
Management
Department of Aquatic Animal Health
Management
group consisted of four replicate aquarium tanks of 70 lit capacity with
each tank stocked with 15 fingerlings (4.40 g±0.05) of O. niloticus for
growth performance. The water quality parameters viz., DO, water
temperature, pH, TAN, NO2-N and NO3-N were in manageable range
for tilapia. At the end of the study period blood and serum samples
were collected for the evaluation of hematological, non-specific
immune and stress parameters. The results indicated that tilapia
reared in treatment groups showed significantly (p<0.05) higher
performance, than the control. Among the treatments, T2 has shown
higher serum protein, anti-protease activity, lysozyme activity and
lower serum glucose and cortisol when compared to T3 and T1.
Growth, food conversion ratio (FCR), feed efficiency ratio (FER) and
specific growth rate (SGR) of fishes in biofloc (T1) and biofloc cum
substrate (T2 and T3) treatments were significantly (p<0.05) higher
than the control. The treatment T2 showed significantly higher RBC,
WBC, platelet count, Hb, HCT, MCV, MCH and MCHC values than the
treatments T3, T1 and control. The study revealed that, tilapia reared
in biofloc based culture system in combination with substrates for
periphyton growth can enhance growth, non-specific immune
response and lower stress under minimal water exchange and
restricted feeding.
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